Decreases in blood pressure turn ________ the thirst center of the brain.
A. off
B. on
Answer: B
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The factor(s) that determine the duration of a twitch in various types of fibers is the speed of the
A) hydrolysis of ATP only. B) removal of Ca2+ ions from the sarcoplasm only. C) removal of Ca2+ ions from the sarcoplasm and hydrolysis of ATP and movement of Na+ across their membranes. D) movement of Na+ across their membranes only. E) removal of Ca2+ ions from the sarcoplasm and hydrolysis of ATP.
The sympathetic nervous system will cause vasodilation in the arteries of many blood vessels, but vasoconstriction in the brain. Why does this occur?
What will be an ideal response?
Protection for the interior surface of the stomach against the acids and enzymes in the gastric lumen is afforded by
A) the carpet of mucus secreted by the columnar epithelium lining all portions of the stomach. B) the shallow depressions called gastric pits. C) the rapid rate of mechanical mixing of the stomach contents, which exposes the lining to chyme for only a short time. D) the esophageal sphincter. E) None of the answers are correct.
Myelin is mostly composed of 20% protein and 80% ________.
Fill in the blank(s) with the appropriate word(s).